Thanks for pointing out that Geva as an Hebrew name is more likely used for males.
In European nobility it was used for males ( King Geva Knudsson of Denmark, born: 840 in Denmark) but more often on females as it seems (Geva of Denmark born 752 (?) who married a Wittekind who was born 807(?) and Geva Princess of Italy born 895 in the Netherlands).
Do you think that Tor could be a variant of the Hebrew name Dor? Could it be misread for Tov? There is a female name Tova.